Rubber Chem Encyclopedia

Recycled rubber products require reasonable use of metal oxides

Create Date:2019-06-03 08:44:47Click volume:72
Recycled rubber products require reasonable use of metal oxides

The so-called metal oxide is a compound composed of oxygen and another metal element. In the formulation of recycled rubber products, metal oxides such as iron oxide, zinc oxide, sodium oxide and magnesium oxide are very common, and they play a role in different recycled rubber products. Unique advantages; then, in the actual production process, what role does the metal oxide have in the production of recycled rubber products? What issues should be paid attention to when adding metal oxides to the recycled rubber product formula?

When using recycled rubber to produce rubber products, metal oxides are generally used in reclaimed rubber vulcanization systems and reinforcing filling systems.

1. The role of metal oxides in vulcanization systems

In the production of reclaimed rubber products, metal oxides can be used as vulcanizing agents and epoxy resins. The hardness and tensile strength of reclaimed rubber after vulcanization are high. Recycled vulcanizates have good heat resistance and dynamic properties, zinc oxide, Magnesium oxide, calcium oxide and calcium hydroxide can achieve this effect; zinc oxide and magnesium oxide in the metal oxide can also be used as a vulcanization accelerator in the reclaimed rubber vulcanization system to activate the vulcanization system and improve the vulcanization efficiency.

Recycled vulcanizates vulcanized with metal oxides have higher heat generation and poor flexural resistance during use. Therefore, reclaimed rubber products requiring low heat generation and high flex resistance are not suitable for vulcanization of metal oxides; zinc oxide It is easy to cause scorch during use, and it is necessary to use stearic acid in combination to alleviate the scorch and improve the vulcanization speed of reclaimed rubber and the mechanical strength and hardness of reclaimed rubber vulcanizate.

2. The role of metal oxides in reinforcing filling systems

Metal oxides can also be used as inorganic fillers in reinforcing filling systems in the production of reclaimed rubber products. Zinc oxide, titanium dioxide and antimony trioxide are all white powdery fillers commonly used in reclaimed rubber products, especially in light colors. In the production of color reclaimed rubber products; titanium dioxide, which we often call titanium white powder, can not only be used as a filler in the reclaimed rubber to improve the mechanical strength and anti-aging properties of the rubber compound, but also a coloring agent commonly used in the reclaimed rubber industry, which is resistant to light and sun. Long-term exposure to the outside is not easy to crack, no discoloration; when the reclaimed rubber products are selected by magnesium oxide filling, the fluidity and oxidation resistance of the rubber compound can be improved, and the tensile strength and impact resistance of the recycled rubber product can be increased.

Perhaps you will ask, what is the amount of metal oxide used in recycled rubber products? This small series can only say: specific analysis of specific problems, it has been said that magnesium oxide in reclaimed rubber products can be filled with about 20 copies, but this is not absolute, the so-called suitable for yourself is the best, it also requires you Master yourself. Metal oxides can be used not only as vulcanizing agents and fillers in the production of reclaimed rubber products, but also have many uses, and Xiaobian will not elaborate here.